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If the coefficients of x^(3) and x^(4) i...

If the coefficients of `x^(3) and x^(4)` in the expansion of `(1+ ax+ bx^(2)) (1 - 2x)^(18)` in powers of x are both zero, the (a, b) is equal to
(1) `(16 ,(251)/3)`
(2) `(14 ,(272)/3)`
(3) `(14 ,(251)/3)`
4) `(16 ,(272)/3)`

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